Abstract: In 21 century, the traditional manufacturing industry will be faced with challenge. The mode of network manufacturing will replace the mode of traditional manufacturing. But, because Internet is open and undefended network, it must cause security risks. In this paper, on the basis of the analysis of the information security requirements of a network manufacturing system, a new solution scheme, which digital certificate encrypts and signs the transmitted data, has been provided. The way solves ultimately security problems of network manufacturing.